BiblioVault may have an electronic file which would meet your requirements for this title:
For the Health of the Land: Previously Unpublished Essays And Other Writings
J. Baird Callicott, Aldo Leopold, Scott Russell Sanders and Eric T. Freyfogle
Paper: 978-1-55963-764-0
Cloth: 978-1-55963-763-3
Electronic: 978-1-59726-798-4